Valve-gear for compound locomotives-engines.



No. 736,889. PATENTBD AUG. 18, 1903.

` W. M. SMITH.

VALVE GEAR POR GOMPOUND LOCOMOT-IVE ENGINES. APPLIOATIONPILED MAY-19. 1902.

UNITED STATES Patented August 18, 1903.

PATENT OEEICE.

VALVE-GEAR FOR COMPOUND LOCOMOTlVE-ENGINES.

SPECIFICATION forming part of Letters Patent No. 736,889, dated. August 18, 1903.

Original application led April 10, 1901, Serial No. 551261. Divided and this application i'lled May 19l 1902. Serial No.108,080. (No model.)

To all whom t may concern.'

Be it known that I, WALTER MAcKEEsIE SMITH, a subject of the King of Great Britain and Ireland, residing at Newcastleupon- Tyne,in the county of NOrthumberland,Eug land, have invented Improvements in the Valve- Gear of Compound Locomotive-Engines, of which Ithe following is a specification.

This invention has reference to improvements in valve-gear for compound locomotive-engines whereby the steam supplied to the cylinders is controlled by a single set of valve-gear operated by only one eccentric.

The invention is particularly applicable to engines of-the kind described in my other application, Serial No. 55,261, filed April 10, 1901, of which this application is a division, wherein two valves are reciprocated simultaneously.

Referring to the accompanying illustrative drawings, Figures 1 and 2 show, respectively in sectional elevation and sectional plan,

valve-gear according to this invention.

The eccentricl is mounted on the crankshaft 2 and is connected with the link et by means of an eccentric-rod 5. The link el. is mounted on trunnions 6 in a bracket 7, secured to a beam 8, which extends transversely of the engine andis secured to the side framing 8ll thereof. 1 i

9 is the block or die which works in the slot in the link et and is carried by one end of an intermediate link 10, connected at its other end to an arrn'll, fixed toa rock-shaft l2, mounted in bearings 13`in the side frames 8. The intermediate link 10 is connected by a link 13 to an arm 14 on a shaft 15, an arm 16 of which is connected to the reversinghandle. The rock-shaft l2 has also fixed to it two other arms 16 and 16a, connected by links 17 and 17l with the forked upper end of a lever 18. This lever is connected 'by a pivot-pin slightly below to a stem 19, one end of which works in a fixed guide-sleeve 20, Fig. l, and the other end of which is connected to a cross-head 21, that rigidly connects together the two valve-spindles 23 and 24 and causes them when the cross-head is operated to move together. The lower end vof the lever 18 is connected by a link 25 to a boss 26 on the cross-head 27 of the low-pressure piston-rod.

What I claim is- In a compound locomotive-engine, the combination with a high-pressure cylinder and a low-pressure cylinder, and a separate valve and valve-chest for each cylinder, of a crankshaft, a single eccentric on said crank-shaft, a link connected to and driven by said eccentric, a three-armed rock-shaft one arm of said shaft being connected to said link, and the other arms to a lever that is connected to a cross-head that connects said valves together so that they always move in the same direction, said lever being also connected with a reciprocating part of the engine, as set forth.

Signed at Newcastle-upon-Tyne this 7th day of May, 1902.

WALTER MACKERSIE SMITH.

Witnesses:

RALPH J. RoBsoN, JOHN WEATHEEBUEN. 

